By aligning the pin with the socket and inserting the tail portion of the pin into the cavity of the socket, a separable reliable mechanical and electrical interconnection is formed between the first board and the second board.

The plug (1) comprises a moving plug pin (3) which enters a spring mouth (51) of the socket (2) during coupling.

The first passage is adapted to receive a male pin-type cable end connectior inserted into the first passage.

Each socket has an inner leg (42, 52), an outer leg (44, 54), an a portion (46, 56) which is narrower than a plug prong.

The plug pin (3) and also the spring mouth (51) are each anchored in their plug housing (4) and, respectively, socket housing (6) in a watertight manner.

The plated through-hole serves both as an electrical point of connector and as an access way for male mating pin.

The printed circuit board (1) is connected to at least one plug connector via at least one plug pin (2).

Each side wall includes an inwardly formed section or radiused rib (120, 122) to position a male terminal (130, 132, 134) inserted into the electrical receptacle in alignment with the spring beam.

A drilling tool connection (135, 301) includes a male pin (205, 305), a female box connector (225, 325), and a locking pin (265, 365).

The shape of the contact spring increases the contact engagement or holding force on a male pin during mating.

The socket contact (21) is expandable so that the centrally disposed opening (111) can enlarge to accommodate the pin (27) passing therethrough into the bore (85).

A distributed and balanced contact force is exerted on a male terminal pin that is inserted between the primary contact beams and the contact bumps.

The assembled sleeve and spring cage is capable of biasingly receiving and engaging an extending and inserting portion of the male pin (12).

The box connector element has at least one transverse bore (240, 340) formed in the box (225, 325) adapted to receive the hexagonal portion (215) of the male pin (205).